City of God. Translated by Henry Bettenson. Introduced by John O'Meara . New York: Penguin Books, 1984.
Confessions. Translated by F. J. Sheed. Introduced by Peter Brown. Indianapolis and Cambridge: Hackett Publishing Company, 1993.
The Trinity. Translated by Edmund Hill. Brooklyn: New City Press, 1990.
A Companion to the Study of St. Augustine. Edited by Roy W. Battenhouse . Grand Rapids: Baker Book House, 1979. Contains an especially helpful essay on Augustine's view of the relationship between faith and reason.
Augustine of Hippo. A biography by Peter Brown. Berkeley and Los Angeles: University of California Press, 1967. Widely regarded as the best biography of Augustine.
The Christian Philosophy of St. Augustine. Etienne Gilson, translated by L. E.M. Lynch. New York: Octagon Books, 1988. The best general introduction to Augustine. Although sometimes inaccurate in its presentation of the details of Augustine's thought, it captures the spirit of his thinking.
Guide to the Study of Saint Augustine. Eugéne Portaliè, translated by Ralph J. Bastian, introduction by Vernon J. Bourke. London: Burns & Oates, 1960. A useful corrective to some of Gilson's mistakes, especially regarding the doctrine of illumination. Generally accurate as to details, at least on the purely philosophical issues, but completely missing the spirit of Augustine's thought.
Wisdom from St. Augustine. Vernon J. Bourke. Houston: Center for Thomistic Studies, 1984.
The essay "Moral Illumination" is a helpful study of some of the issues raised in On Free Choice of the Will.